(x+1)(x-1)=(x+1)(x-2)

Solution for (x+1)(x-1)=(x+1)(x-2) equation:

Simplifying
(x + 1)(x + -1) = (x + 1)(x + -2)

Reorder the terms:
(1 + x)(x + -1) = (x + 1)(x + -2)

Reorder the terms:
(1 + x)(-1 + x) = (x + 1)(x + -2)

Multiply (1 + x) * (-1 + x)
(1(-1 + x) + x(-1 + x)) = (x + 1)(x + -2)
((-1 * 1 + x * 1) + x(-1 + x)) = (x + 1)(x + -2)
((-1 + 1x) + x(-1 + x)) = (x + 1)(x + -2)
(-1 + 1x + (-1 * x + x * x)) = (x + 1)(x + -2)
(-1 + 1x + (-1x + x2)) = (x + 1)(x + -2)

Combine like terms: 1x + -1x = 0
(-1 + 0 + x2) = (x + 1)(x + -2)
(-1 + x2) = (x + 1)(x + -2)

Reorder the terms:
-1 + x2 = (1 + x)(x + -2)

Reorder the terms:
-1 + x2 = (1 + x)(-2 + x)

Multiply (1 + x) * (-2 + x)
-1 + x2 = (1(-2 + x) + x(-2 + x))
-1 + x2 = ((-2 * 1 + x * 1) + x(-2 + x))
-1 + x2 = ((-2 + 1x) + x(-2 + x))
-1 + x2 = (-2 + 1x + (-2 * x + x * x))
-1 + x2 = (-2 + 1x + (-2x + x2))

Combine like terms: 1x + -2x = -1x
-1 + x2 = (-2 + -1x + x2)

Add '-1x2' to each side of the equation.
-1 + x2 + -1x2 = -2 + -1x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-1 + 0 = -2 + -1x + x2 + -1x2
-1 = -2 + -1x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-1 = -2 + -1x + 0
-1 = -2 + -1x

Solving
-1 = -2 + -1x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add 'x' to each side of the equation.
-1 + x = -2 + -1x + x

Combine like terms: -1x + x = 0
-1 + x = -2 + 0
-1 + x = -2

Add '1' to each side of the equation.
-1 + 1 + x = -2 + 1

Combine like terms: -1 + 1 = 0
0 + x = -2 + 1
x = -2 + 1

Combine like terms: -2 + 1 = -1
x = -1

Simplifying
x = -1